Method of reclaiming plastic product with paint film

Abstract

A method of reclaiming a plastic product having a paint film, including the steps of: obtaining crushed particles by crushing a plastic product having a paint film into particles of a predetermined size; supplying the crushed particles to a screw-type extruder; kneading and fusing the crushed particles while supplying water thereto; and obtaining a plastic by discharging a gas produced by decomposing the paint film and vaporized water.

What is claimed is: 
     
       1. A method of reclaiming a plastic product having a paint film, comprising the steps of: obtaining crushed particles by crushing a plastic product having a paint film into particles of a predetermined size;   supplying the crushed particles to a screw extruder;   kneading and fusing the crushed particles while supplying water thereto such that the paint film is separated from the plastic body, decomposed and gasified into decomposed gas; and   obtaining a plastic by discharging said decomposed gas.   
     
     
       2. A method of reclaiming a plastic product having a paint film as claimed in claim 1, wherein the steps of kneading the crushed particles while supplying water thereto and discharging the decomposed gas produced by decomposing the paint film and vaporized water are repeated twice or more inside the screw extruder. 
     
     
       3. A method of reclaiming a plastic product having a paint film as claimed in claim 1, wherein said step of discharging the decomposed gas is performed using forced suction.   
     
     
       4. A method of reclaiming a plastic product having a paint film as claimed in claim 1, wherein the water supplied to the screw extruder is an alkali aqueous solution. 
     
     
       5. A method of reclaiming a plastic product having a paint film as claimed in claim 1, further comprising the steps of: immersing the crushed particles into or bringing the crushed particles into contact with an ethanol solution; and   supplying the thus treated crushed particles to the screw extruder thereafter.   
     
     
       6. A method of reclaiming a plastic product having a paint film as claimed in claim 1, wherein the crushed particles are obtained by crushing a bumper of an automobile, the bumper being made of a thermoplastic resin and having a paint film.